corresponding changes for these f factors to AR(e/H) with wavy
sidewalls are comparatively examined to study their general impacts
on f augmentations. As an attempt to develop the empirical
f correlations, the depiction of (a) f (b) f/f1 variations by adjusting
AR(e/H) and Re for present test channels is shown by Fig. 7. The f1
reference selected to normalized present f data is evaluated from
Blassius equation as 0.079Re_0.25. Also included in Fig. 7 are the f
and f/f1 data detected from the two-pass ribbed square channels
with V-ribs [17] and 45_ ribs [38,39].